The highest contrast ratio of the HP W2207h is 3000:1. That's 100% less contrast ratio than the most frequently found dynamic contrast ratio of 20000000:1. PC displays that came out around the same time as the W2207h dynamic contrast ratios range from Mega Contrast to 100000000:1.
It may also be worth also looking at one of the alternative flatpanel monitors that have a 3000:1 dynamic contrast ratio currently available including the ZR22w (£140.26), or the Compaq LA2405 (£149.99) both from HP or the Samsung S24C750 which has a better Rating.
If you would prefer an LCD screen with a higher contrast ratio then you might want to consider the ET220a (10000:1), or the ES240d Slim (£113.93) (10000:1) both from Edge10 or the Samsung UD22B (£1,658.98) (10000:1).